import java.util.Scanner;
public class Example2_3 {
  public static void main (String args[]){
    System.out.println("请输入若干个数，每输入一个数回车确认");
    System.out.println("最后输入数字0结束操作");
    Scanner reader = new Scanner (System.in);
    double sum = 0;
    double x =reader.nextDouble();
    while(x!=0){
      sum = sum +x;
      x = reader.nextDouble();
    }
    System.out.println("sum = " + sum);
  }
}

